bh5

87 renix cherokee, 4.0 auto.*
Started to notice a slight hesitation when first accelerating a couple days ago. Nothing real bad. Then drove home from work, parked it couple hours, when I left to pick up kids from school, hesitation and engine cut out was so bad I could not drive it on the highway. Starts and idles fine, just cuts out badly while driving. First thought was fuel pump or filter, so replaced both, no change. Checked MAP sensor, bad readings, replaced it, and now seems to be worse. Started it to let it idle, it ran for a few seconds and died. Starts right back up, but dies intermittently at times. Checked coil, tested good. Any advice or recommendations would be greatly appreciated. Thanks.

bh5

Also... after fuel pump and filter replaced, I test drove around block, started out good, could tell it was not completely fixed, but not bad, but by the time I got back home, it was consistently cutting out and sputtering. Still idles fine and revs fine in park.

cruiser54

See if the fuel pump ballast resistor by the air cleaner has tight fitting connections.

If you feel inclined, you can bypass it as it's only there to reduce fuel pump noise.

cruiser54

That said, if it were me, I would click on the link in my signature and do the free and easy things outline in posts 1 through 5 before replacing anything.

freegdr

Any bare spots in wiring to cps ?

bh5

Thanks for the info cruiser, I will be doing 1 thru 5 in the morning, and hoping that they will cure my problem. No bare spots that I could find freegdr, although once inawhile, my xj wont start, just cranks, after unplugging and plugging back in the cps, she starts right up. More reasons to clean connectors like cruiser suggestion I suppose. Will keep updating.

67 GMC

Do all the things on Cruiser's post-grounds are a big problem-I had that same issue and I could get the Jeep to cut out idleing if I jiggled the wiring harness. Also check to see if the CPS wire is shorted to the block somewhere. It needs to be routed well away from anything hot. Ask me how I know!

cruiser54

Your Jeep is giving you a hint........

"unplugging CPS"

Where are you in Az?

bh5

The CPS could be causing this cut out problem? I thought it would cause a start or no start issue, never crossed my mind that it could cause this issue. Im in globe/miami.

cruiser54

Heck yes. Complete cut-off if the signal is interrupted.

Looking forward to your reply tomorrow.

Got a digital meter?

bh5

Yes I do sir.

cruiser54

You're gonna need it. For sure on #5 and #7, which I just added......

If you do these things in order, you might actually fix stuff on the way and get good results from your ohms tests. I set it up that way.

freegdr

How long you been owner ? Ever been replaced ?

bh5

I have owned about a year and a half, previous owner replaced it a couple months prior to me buying it. So its about two years old.

bh5

Well, got a little busy yesterday, wasnt able to do everything. But I was able to do 1 and 2 on your list, and my xj is back to normal. Thank you cruiser for the insight and information. I willbe adding it to my favorites for future reference.